I can't tell you how to get past 225, but I can tell you how I got there -- and maybe you could apply that to your plateau. My current working set is 225 at around 6 to 7 reps. So I can bench more than 225, but I judge my lifts by being able to get at through at least 5 reps.
I used a power cage. I think its one of the most misused/underused piece of equipment in the gym. 90% of the folks I see in the cage are either using it as a squat rack, or a place to do forearm curls. The pins are there for a reason and most people don't utilize it as a plateau buster.
Anyway, once a week after a chest workout I put the pins at various heights and work all of my sticking points individually. At the lockout, I load the bar (in small increments) to quite a bit over my 1 rep max and do partials. It gets your system accustomed to holding heavier weights.
Another technique I used is dead stop benching. Put the pins just above your chest, slide under and do 1 rep from a dead stop -- as slow as you need to get the weight up. Start from a manageable weight and load small increments until a single rep is brutal to get up.
Eat lots of chicken and other proteins.
This made a difference in my bench press, and I'm sure it's going to get me to 315 eventually.